I am currently trying to get Rhythmbox to recognized my Sansa Clip+, which used to work in previous versions. I am now on a fresh Xubuntu install and it no longer recognizes the player. However running Rhythmbox with rhythmbox -d and then manually mounting the players shows that the player is actually detected properly, it just never shows up in the GUI. The last line, Unhandled media hints at something being wrong, but what?